EP0835769B9 - Supporting device for tyre tread - Google Patents

Supporting device for tyre tread Download PDF

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Publication number
EP0835769B9
EP0835769B9 EP97116530A EP97116530A EP0835769B9 EP 0835769 B9 EP0835769 B9 EP 0835769B9 EP 97116530 A EP97116530 A EP 97116530A EP 97116530 A EP97116530 A EP 97116530A EP 0835769 B9 EP0835769 B9 EP 0835769B9
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EP
European Patent Office
Prior art keywords
support
top cap
radially
rib
ring
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Expired - Lifetime
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EP97116530A
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German (de)
French (fr)
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EP0835769A1 (en
EP0835769B1 (en
Inventor
Renaud Rivaton
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Compagnie Generale des Etablissements Michelin SCA
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Compagnie Generale des Etablissements Michelin SCA
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Publication of EP0835769B1 publication Critical patent/EP0835769B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C17/00—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor
    • B60C17/04—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor utilising additional non-inflatable supports which become load-supporting in emergency
    • B60C17/06—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor utilising additional non-inflatable supports which become load-supporting in emergency resilient
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C17/00—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor
    • B60C17/04—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor utilising additional non-inflatable supports which become load-supporting in emergency
    • B60C17/06—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor utilising additional non-inflatable supports which become load-supporting in emergency resilient
    • B60C2017/068—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor utilising additional non-inflatable supports which become load-supporting in emergency resilient comprising springs, e.g. helical springs

Definitions

  • the invention relates to a tread support device for tire, said device being used in the case of rolling of the tire under zero or low inflation pressure.
  • the use of such a device says also safety and mounted inside the tire, must allow the vehicle, equipped and loaded, to continue driving despite the partial or total loss of pressure inflation, rolling continuity proving beneficial for various reasons known.
  • EP 0 635 384 A corresponding to the preamble of claim 1, a device has been proposed. safety formed of two materials and comprising at least one rigid support and one elastic screed in vulcanized rubber mixture, said screed surrounding the support rigid. Between said support and said yoke is disposed a lubricant allowing the circumferential displacement of the yoke on the support, while the shape radially outside of the support crown support cooperates with the elements of reinforcement arranged in the yoke to ensure radial retention and guidance circumferential (transverse support) of the yoke on the support.
  • the elements of reinforcement consist of at least one rod to which we add reinforcements reinforcement comprising at least one ply passing radially under said rod.
  • High-performance safety devices are often used on vehicles having a "centralized" inflation system, that is to say a system allowing the inflation and deflation of the tire while driving, the use of a solid lubricant or pasty, but which disperses under the effects of friction and heat, causes malfunctions in the inflation system.
  • the invention aims to improve the above device and to avoid as much as possible diffusion of the lubricant.
  • the invention proposes to modify the meridian profiles of the radially upper face of the support crown of the support and of the face radially inner of the coping respectively, at the level of the crown edges.
  • the tire tread support device in accordance with the invention and comprising at least one rigid support and an elastic yoke in vulcanized rubber mix, a lubricant, disposed between said support and said yoke, allowing circumferential movement between the support and the yoke, while the radially outer shape of the support crown of the support having two edges cooperates with the reinforcing elements arranged in the yoke to ensure the radial retention and the circumferential guidance of said yoke on the support, is characterized in that each crown rim is provided on its edge with at least one rectilinear circumferential groove in which a rib is housed circumferential disposed on the radially inner face of the part of the yoke rubber corresponding to the edge of the support crown, said rib being in contact with at least the bottom of the corresponding groove of the rim, without said rib is compressed on the bottom of said groove.
  • each rib of the yoke being in contact with the bottom of the corresponding groove on the rim, the lubricant is blocked during normal driving, while allowing the rotation of the yoke around the support in rolling mode degraded (low pressure or zero pressure), lubrication being sufficient at the level grooves and the tightening of the rib on the groove being zero.
  • the support crown of the support comprises a crown base and, axially on either side, two crown edges, the radially outer face of said crown bottom being further from the axis of rotation of the device than the radially outer faces of the flanges, and where else share the elastic yoke includes radially inside in each of its edges a reinforcement rod arranged axially opposite the outer face of the flange crown, each rib of the radially inner face of the yoke is advantageously located axially outside the projection on said face of the maximum axial width of the reinforcing rod.
  • the efficiency of the above system is greatly improved if the space between the clevis and the support crown remains as constant as possible over the axial width, except the width corresponding to the grooves and ribs, whatever the driving conditions, i.e. at rest, in normal driving, and in driving mode degraded.
  • the reinforcement turned around the two rods located in the lateral edges, is formed of cables preferably in aromatic polyamide, and is surmounted, in its central part, by a layer of cables, mutually parallel and at an angle to the circumferential direction more equal to 10 ° and preferably equal to or very close to 0 ° (i.e.
  • said cables also being in aromatic or metallic polyamide.
  • This variant allows to better maintain the meridian profile between the end of vulcanization of the screed and its positioning on the support, while ensuring a better distribution of forces due to centrifugal force during rolling, by shrinking the central part of said clevis.
  • a reduction in the masses on the lateral edges of the screed can also be advantageously obtained by the adoption of a suitable lateral meridian profile, said profile being characterized in that it comprises, seen in cross section, a recess concave surrounded on both sides by two convex protuberances.
  • the weight distribution will be optimized by the presence on the radially outer face of the yoke of at least one central groove, the lateral meridian profile which may likewise include a concave recess, allowing flexibility of the elastic screed and promoting its mountability.
  • the safety device S shown in Figure 1 and intended to be mounted at the interior of a tire P, for example of dimension 14.00-20 X, is composed of three parts: a rigid metal support (1), a non-rigid elastic screed (2) intended to come into contact with the inner face of the crown of the tire P, and a annular piece (not shown) of connection with a usual removable rim, that is to say formed of at least three parts.
  • the rigid support (1) is an aluminum alloy support. It is formed, seen in meridian section, of a base (not shown) surmounted radially by a disc (not shown), itself surmounted by the support crown (12), intended to receive on its radially outer face the lubricant layer (5) of the yoke (2).
  • This support ring (12) has a transverse shape similar to the shape of a rim, but inverted, that is to say with a ring bottom (120) further from the axis of rotation of the device than the tops of the crown edges (122).
  • the crown base (120) has a slightly convex radially outer face (121), that is to say the center of curvature of which is located on the trace XX ′ of the equatorial plane of the device and radially inside.
  • the edges (122) are each provided with a circumferential and rectilinear groove (124), said groove having a depth h equal to 0.15 times e 2 , but may be between 0.10 and 0.25 times said thickness e 2 of the yoke (2), while its width measured at the top of the groove is equal to h, but can be between 0.4 h and 1.4 h.
  • the groove (124) has two walls having with the radially outer face (123) of the rim (122) of the support ring (12) circular connection fillets, and are joined to a flat or circular bottom by two circular fillets .
  • the parts of the radially outer faces (123) of the flanges (122), the closest to the crown bottom (120) are practically rectilinear and parallel to the axis of rotation.
  • the distance, separating the point of the radially outer face (121) from the bottom (120) furthest from the axis of rotation of the straight line joining the faces (123) of the flanges (122), is equal to 22 mm, and generally at least equal to 0.25 times the thickness e 2 of the yoke (2).
  • Said yoke (2) is in the form of a closed circular ring and has one face radially inner (200) which geometrically matches, -in its central part, the meridian profile of the radially outer face (121) of the support ring (12), being constantly distant from the face (121) by an amount equal to 1 mm, so as to provide maximum efficiency of the lubricant (5).
  • Said face (200) is provided on each of its lateral edges of a circumferential rib (25), facing the groove (124) of the support crown (12).
  • the diameter D of its generator is the same as the diameter D of the generatrix of the groove (124) closest to the axis of rotation, this which means that the tightening of the rib on the groove is zero and that there is no compression of the rib rubber.
  • the axial width of the rib is less than the axial width h of the groove of the support, and said rib is located axially outside the projection t on the face (200) of the diameter, in the axial direction, of the braided rod (21).
  • the yoke (2) comprises, radially inside, a layer (20) of mixture vulcanized with a low coefficient of friction with aluminum while having high mechanical resistance, in order to be able to resist surface imperfections support (1), and to foreign bodies which may possibly be inserted between said support (1) and the yoke (2).
  • the rods (21), coated with a rubbery mixture, are anchor rods for a reinforcing reinforcement (23), composed of a single ply of metallic steel cables and turned outward on said rods (21) to form reversals (230).
  • the rods are of the "braided” type, preferably without a central core, which allows good resistance to tension forces while allowing ovalization sufficient for easy introduction of the yoke (2), thus reinforced, in the pneumatic P.
  • This frame is surmounted radially on the outside of a tread (24) of vulcanized rubber mixture, having the distinction of having losses weak hysteretics, in order to minimize the generation of heating.
  • This band of bearing (24) includes two circumferential grooves (240) in the example described.
  • the lateral and non-rectilinear meridian profile on each side of the yoke (2) is also the profile of the yoke (2) of the device shown in Figure 3, yoke (2) radially surmounting a rigid metal support (1).
  • the support ring (12) of the support (1) has at its center a groove (125) included axially between the two flanges (122) of the support ring (12). This groove (125) is intended to receive the rib (26), central and circular, of the elastic yoke (2), a rib which is reinforced by a single rod (21) of the same type and structure as the rods (21) used. in the device shown in Figure 2.
  • the groove (125) has a depth, measured in the equatorial plane XX ', between its point closest to the axis of rotation and the imaginary straight line joining the points of the flanges (122) the most distant from the axis of rotation, such that the outside radius R 4 of the rod (21) for reinforcing the rib is less than the radius of the above imaginary line, said depth e 4 being at least equal to 0 , 25 times the thickness e 2 of the yoke (2).
  • Said screed (2) comprises in its radially lower part a layer of vulcanized mixture (20), identical to those of the screeds of FIGS.
  • a reinforcing reinforcement (23) composed of a ply (231) of polyamide cables aromatic, having a width substantially equal to the width of the support crown for the support and passing radially under the reinforcing rod (21), and, located on either side of the equatorial plane XX ', of two narrow plies ( 232) formed, each of metallic steel cables making with the circumferential direction an angle between 0 ° and 5 °, the axial width of each of these plies (232) being equal to 0.25 times the axial width of the ply ( 231).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)
  • Support Of The Bearing (AREA)

Description

L'invention concerne un dispositif de soutien de bande de roulement de pneumatique, ledit dispositif étant utilisé dans le cas de roulage du pneumatique sous une pression de gonflage nulle ou de faible valeur. L'utilisation d'un tel dispositif, dit aussi de sécurité et monté à l'intérieur du pneumatique, doit permettre au véhicule, équipé et chargé, de continuer à rouler malgré la perte partielle ou totale de pression de gonflage, la continuité du roulage se révélant bénéfique pour différentes raisons connues.The invention relates to a tread support device for tire, said device being used in the case of rolling of the tire under zero or low inflation pressure. The use of such a device, says also safety and mounted inside the tire, must allow the vehicle, equipped and loaded, to continue driving despite the partial or total loss of pressure inflation, rolling continuity proving beneficial for various reasons known.

Il a été proposé, dans la demande Européenne EP 0 635 384 A correspondant au préambule de la revendication 1, un dispositif de sécurité formé de deux matériaux et comprenant au moins un support rigide et une chape élastique en mélange caoutchouteux vulcanisé, ladite chape entourant le support rigide. Entre ledit support et ladite chape est disposé un lubrifiant permettant le déplacement circonférentiel de la chape sur le support, alors que la forme radialement extérieure de la couronne d'appui du support coopère avec les éléments de renforcement disposés dans la chape pour assurer le maintien radial et le guidage circonférentiel (maintien transversal) de la chape sur le support. Les éléments de renforcement sont composés d'au moins une tringle à laquelle on adjoint des armatures de renforcement comprenant au moins une nappe passant radialement sous ladite tringle.In European application EP 0 635 384 A corresponding to the preamble of claim 1, a device has been proposed. safety formed of two materials and comprising at least one rigid support and one elastic screed in vulcanized rubber mixture, said screed surrounding the support rigid. Between said support and said yoke is disposed a lubricant allowing the circumferential displacement of the yoke on the support, while the shape radially outside of the support crown support cooperates with the elements of reinforcement arranged in the yoke to ensure radial retention and guidance circumferential (transverse support) of the yoke on the support. The elements of reinforcement consist of at least one rod to which we add reinforcements reinforcement comprising at least one ply passing radially under said rod.

Les dispositifs de sécurité performants étant souvent utilisés sur des véhicules possédant un système de gonflage "centralisé", c'est-à-dire un système permettant le gonflage et dégonflage du pneumatique en roulage, l'utilisation d'un lubrifiant solide ou pâteux, mais qui se disperse sous les effets de frottement et de la chaleur, provoque des dysfonctionnements dans le système de gonflage. High-performance safety devices are often used on vehicles having a "centralized" inflation system, that is to say a system allowing the inflation and deflation of the tire while driving, the use of a solid lubricant or pasty, but which disperses under the effects of friction and heat, causes malfunctions in the inflation system.

L'invention vise à perfectionner le dispositif ci-dessus et éviter au maximum la diffusion du lubrifiant. Pour cela, l'invention propose de modifier les profils méridiens de la face radialement supérieure de la couronne d'appui du support et de la face radialement intérieure de la chape respectivement, au niveau des rebords de couronne.The invention aims to improve the above device and to avoid as much as possible diffusion of the lubricant. For this, the invention proposes to modify the meridian profiles of the radially upper face of the support crown of the support and of the face radially inner of the coping respectively, at the level of the crown edges.

Le dispositif de soutien de la bande de roulement d'un pneumatique, conforme à l'invention et comprenant au moins un support rigide et une chape élastique en mélange caoutchouteux vulcanisé, un lubrifiant, disposé entre ledit support et ladite chape, permettant le déplacement circonférentiel entre le support et la chape, alors que la forme radialement extérieure de la couronne d'appui du support ayant deux rebords coopère avec les éléments de renforcement disposés dans la chape pour assurer le maintien radial et le guidage circonférentiel de ladite chape sur le support, est caractérisé en ce que chaque rebord de couronne est muni sur son bord d'au moins une rainure circonférentielle rectiligne dans laquelle vient se loger une nervure circonférentielle disposée sur la face radialement intérieure de la partie de la chape en caoutchouc correspondant au rebord de la couronne d'appui du support, ladite nervure étant en contact avec au moins le fond de la rainure correspondante du rebord, sans que ladite nervure soit comprimée sur le fond de ladite rainure.The tire tread support device, in accordance with the invention and comprising at least one rigid support and an elastic yoke in vulcanized rubber mix, a lubricant, disposed between said support and said yoke, allowing circumferential movement between the support and the yoke, while the radially outer shape of the support crown of the support having two edges cooperates with the reinforcing elements arranged in the yoke to ensure the radial retention and the circumferential guidance of said yoke on the support, is characterized in that each crown rim is provided on its edge with at least one rectilinear circumferential groove in which a rib is housed circumferential disposed on the radially inner face of the part of the yoke rubber corresponding to the edge of the support crown, said rib being in contact with at least the bottom of the corresponding groove of the rim, without said rib is compressed on the bottom of said groove.

Alors qu'il existe sur la largeur axiale commune entre la face radialement extérieure de la couronne d'appui métallique et la face radialement intérieure de la chape de caoutchouc un espace de faible dimension radiale, destiné à conférer au lubrifiant le maximum d'efficacité, chaque nervure de la chape étant en contact avec le fond de la rainure correspondante du rebord, le lubrifiant est bloqué en roulage normal, tout en permettant la rotation de la chape autour du support en roulage en mode dégradé (faible pression ou pression nulle), la lubrification étant suffisante au niveau des rainures et le serrage de la nervure sur la rainure étant nul.While it exists on the common axial width between the face radially outside of the metal support ring and the radially inner face of the rubber screed a space of small radial dimension, intended to give the lubricant maximum efficiency, each rib of the yoke being in contact with the bottom of the corresponding groove on the rim, the lubricant is blocked during normal driving, while allowing the rotation of the yoke around the support in rolling mode degraded (low pressure or zero pressure), lubrication being sufficient at the level grooves and the tightening of the rib on the groove being zero.

Dans le cas d'un dispositif où d'une part la couronne d'appui du support comprend un fond de couronne et, axialement de part et d'autre, deux rebords de couronne, la face radialement extérieure dudit fond de couronne étant plus éloignée de l'axe de rotation du dispositif que les faces radialement extérieures des rebords, et où d'autre part la chape élastique comprend radialement à l'intérieur dans chacun de ses bords une tringle de renforcement disposée axialement en regard de la face extérieure du rebord de couronne, chaque nervure de la face radialement intérieure de la chape est avantageusement située axialement à l'extérieur de la projection sur ladite face de la largeur axiale maximale de la tringle de renforcement.In the case of a device where on the one hand the support crown of the support comprises a crown base and, axially on either side, two crown edges, the radially outer face of said crown bottom being further from the axis of rotation of the device than the radially outer faces of the flanges, and where else share the elastic yoke includes radially inside in each of its edges a reinforcement rod arranged axially opposite the outer face of the flange crown, each rib of the radially inner face of the yoke is advantageously located axially outside the projection on said face of the maximum axial width of the reinforcing rod.

L'efficacité du système ci-dessus est grandement améliorée si l'espace entre la chape et la couronne d'appui reste le plus constant possible sur la largeur axiale, excepté la largeur correspondant aux rainures et nervures, quelles que soient les conditions de roulage, c'est-à-dire au repos, en roulage normal, et en roulage en mode dégradé. Afin de maintenir le profil méridien de la face radialement intérieure de la chape, il est avantageux que l'armature de renforcement, retournée autour des deux tringles situées dans les bords latéraux, soit formée de câbles préférentiellement en polyamide aromatique, et soit surmontée, dans sa partie centrale, d'une nappe de câbles, parallèles entre eux et faisant avec la direction circonférentielle un angle au plus égal à 10° et préférentiellement égal à ou très voisin de 0° (c'est-à-dire 0° ± 2,5°), lesdits câbles étant aussi en polyamide aromatique ou métalliques. Cette variante permet de mieux maintenir le profil méridien entre la fin de vulcanisation de la chape et sa mise en place sur le support, tout en assurant une meilleure répartition des efforts dus à la force centrifuge lors du roulage, par frettage de la partie centrale de ladite chape.The efficiency of the above system is greatly improved if the space between the clevis and the support crown remains as constant as possible over the axial width, except the width corresponding to the grooves and ribs, whatever the driving conditions, i.e. at rest, in normal driving, and in driving mode degraded. In order to maintain the meridian profile of the radially inner face of the screed, it is advantageous for the reinforcement, turned around the two rods located in the lateral edges, is formed of cables preferably in aromatic polyamide, and is surmounted, in its central part, by a layer of cables, mutually parallel and at an angle to the circumferential direction more equal to 10 ° and preferably equal to or very close to 0 ° (i.e. 0 ° ± 2.5 °), said cables also being in aromatic or metallic polyamide. This variant allows to better maintain the meridian profile between the end of vulcanization of the screed and its positioning on the support, while ensuring a better distribution of forces due to centrifugal force during rolling, by shrinking the central part of said clevis.

Il est de même avantageux, pour contrecarrer les effets de ladite force centrifuge, d'avoir une répartition des masses la plus homogène possible axialement. Une chape dépourvue sur sa face radialement extérieure de rainures, et l'utilisation de tringles plus légères, soit par la densité des matériaux qui les composent, soit par la diminution de leur surface transversale, permettent d'augmenter les masses au centre de la chape et de les diminuer aux bords.It is likewise advantageous, to counteract the effects of said centrifugal force, to have the most homogeneous mass distribution possible axially. A screed devoid of grooves on its radially outer face, and the use of more rods light, either by the density of the materials that compose them, or by the reduction of their transverse surface, allow to increase the masses in the center of the screed and decrease them at the edges.

Une diminution des masses sur les bords latéraux de la chape peut aussi être avantageusement obtenue par l'adoption d'un profil méridien latéral adapté, ledit profil étant caractérisé en ce qu'il comprend, vu en section transversale, un évidement concave entouré de part et d'autre de deux protubérances convexes.A reduction in the masses on the lateral edges of the screed can also be advantageously obtained by the adoption of a suitable lateral meridian profile, said profile being characterized in that it comprises, seen in cross section, a recess concave surrounded on both sides by two convex protuberances.

Dans le cas d'un dispositif où la couronne d'appui du support présente en son centre une gorge correspondant à une nervure centrale et circonférentielle de la chape, nervure renforcée par une tringle unique, la répartition des masses sera optimisée par la présence sur la face radialement extérieure de la chape d'au moins une rainure centrale, le profil méridien latéral pouvant de même comporter un évidement concave, permettant alors d'assouplir la chape élastique et favoriser sa montabilité.In the case of a device where the support crown of the support has in its center a groove corresponding to a central and circumferential rib of the yoke, rib reinforced by a single rod, the weight distribution will be optimized by the presence on the radially outer face of the yoke of at least one central groove, the lateral meridian profile which may likewise include a concave recess, allowing flexibility of the elastic screed and promoting its mountability.

Les caractéristiques et avantages de l'invention seront mieux compris à l'aide de la description qui suit et qui se réfère au dessin illustrant à titre non limitatif des exemples d'exécution, sur lequel :

  • la figure 1 représente schématiquement, vu en section méridienne, un dispositif conforme à l'invention,
  • la figure 2 représente schématiquement, vue en section méridienne, une variante du dispositif tel que montré sur la figure 1 avec divers perfectionnements,
  • la figure 3 représente schématiquement, vue en section méridienne, une variante du dispositif conforme à l'invention, dans lequel la couronne d'appui du support comprend une gorge.
The characteristics and advantages of the invention will be better understood with the aid of the description which follows and which refers to the drawing illustrating non-limiting examples of embodiment, in which:
  • FIG. 1 schematically represents, seen in meridian section, a device according to the invention,
  • FIG. 2 schematically represents, seen in meridian section, a variant of the device as shown in FIG. 1 with various improvements,
  • Figure 3 shows schematically, seen in meridian section, a variant of the device according to the invention, in which the support crown of the support comprises a groove.

Le dispositif de sécurité S, montré sur la figure 1 et destiné à être monté à l'intérieur d'un pneumatique P, par exemple de dimension 14.00-20 X, est composé de trois parties : un support métallique rigide (1), une chape élastique non rigide (2) destinée à entrer en contact avec la face intérieure du sommet du pneumatique P, et une pièce annulaire (non montrée) de liaison avec une jante démontable usuelle, c'est-à-dire formée d'au moins trois pièces.The safety device S, shown in Figure 1 and intended to be mounted at the interior of a tire P, for example of dimension 14.00-20 X, is composed of three parts: a rigid metal support (1), a non-rigid elastic screed (2) intended to come into contact with the inner face of the crown of the tire P, and a annular piece (not shown) of connection with a usual removable rim, that is to say formed of at least three parts.

Le support rigide (1) est un support en alliage d'aluminium. Il est formé, vu en section méridienne, d'une base (non montrée) surmontée radialement d'un disque (non montré), lui-même surmonté de la couronne d'appui (12), destinée à recevoir sur sa face radialement extérieure la couche du lubrifiant (5) de la chape (2). Cette couronne d'appui (12) a une forme transversale semblable à la forme d'une jante, mais inversée, c'est-à-dire avec un fond de couronne (120) plus éloigné de l'axe de rotation du dispositif que les sommets des rebords de couronne (122). Le fond de couronne (120) a une face radialement extérieure (121) légèrement convexe, c'est-à-dire dont le centre de courbure est situé sur la trace XX' du plan équatorial du dispositif et radialement à l'intérieur. Quant aux rebords (122), ils sont pourvus chacun d'une rainure (124) circonférentielle et rectiligne, ladite rainure ayant une profondeur h égale à 0,15 fois e2, mais pouvant être comprise entre 0,10 et 0,25 fois ladite épaisseur e2 de la chape (2), alors que sa largeur mesurée au sommet de la rainure est égale à h, mais peut être comprise entre 0,4 h et 1,4 h. La rainure (124) possède deux parois présentant avec la face radialement extérieure (123) du rebord (122) de la couronne d'appui (12) des congés de raccordement circulaires, et sont réunies à un fond plat ou circulaire par deux congés circulaires. Les parties des faces radialement extérieures (123) des rebords (122), les plus proches du fond de couronne (120) sont pratiquement rectilignes et parallèles à l'axe de rotation. La distance, séparant le point de la face radialement extérieure (121) du fond (120) le plus éloigné de l'axe de rotation de la droite joignant les faces (123) des rebords (122), est égale à 22 mm, et généralement au moins égale à 0,25 fois l'épaisseur e2 de la chape (2).The rigid support (1) is an aluminum alloy support. It is formed, seen in meridian section, of a base (not shown) surmounted radially by a disc (not shown), itself surmounted by the support crown (12), intended to receive on its radially outer face the lubricant layer (5) of the yoke (2). This support ring (12) has a transverse shape similar to the shape of a rim, but inverted, that is to say with a ring bottom (120) further from the axis of rotation of the device than the tops of the crown edges (122). The crown base (120) has a slightly convex radially outer face (121), that is to say the center of curvature of which is located on the trace XX ′ of the equatorial plane of the device and radially inside. As for the edges (122), they are each provided with a circumferential and rectilinear groove (124), said groove having a depth h equal to 0.15 times e 2 , but may be between 0.10 and 0.25 times said thickness e 2 of the yoke (2), while its width measured at the top of the groove is equal to h, but can be between 0.4 h and 1.4 h. The groove (124) has two walls having with the radially outer face (123) of the rim (122) of the support ring (12) circular connection fillets, and are joined to a flat or circular bottom by two circular fillets . The parts of the radially outer faces (123) of the flanges (122), the closest to the crown bottom (120) are practically rectilinear and parallel to the axis of rotation. The distance, separating the point of the radially outer face (121) from the bottom (120) furthest from the axis of rotation of the straight line joining the faces (123) of the flanges (122), is equal to 22 mm, and generally at least equal to 0.25 times the thickness e 2 of the yoke (2).

Radialement à l'extérieur du support rigide (1), sur la face extérieure de la couronne d'appui (12) recouverte d'une couche de lubrifiant (5) pâteux, est disposée la chape non rigide et élastique (2)Radially outside the rigid support (1), on the outside of the support ring (12) covered with a layer of pasty lubricant (5), is arranged non-rigid and elastic screed (2)

Ladite chape (2) est sous forme d'anneau circulaire fermé et a une face radialement intérieure (200) qui épouse géométriquement,-dans sa partie centrale, le profil méridien de la face radialement extérieure (121) de la couronne d'appui (12), en étant constamment distante de la face (121) d'une quantité égale à 1 mm, de manière à ménager un maximum d'efficacité du lubrifiant (5). Ladite face (200) est munie sur chacun de ses bords latéraux d'une nervure (25) circonférentielle, en regard de la rainure (124) de la couronne d'appui (12). Dimensionnellement, le diamètre D de sa génératrice, radialement la plus proche de l'axe de rotation, est le même que le diamètre D de la génératrice de la rainure (124) la plus proche de l'axe de rotation, ce qui signifie que le serrage de la nervure sur la rainure est nul et qu'il n'y a pas compression du caoutchouc de la nervure. Axialement, la largeur axiale de la nervure est inférieure à la largeur axiale h de la rainure du support, et ladite nervure est située axialement à l'extérieur de la projection t sur la face (200) du diamètre, dans la direction axiale, de la tringle tressée (21).Said yoke (2) is in the form of a closed circular ring and has one face radially inner (200) which geometrically matches, -in its central part, the meridian profile of the radially outer face (121) of the support ring (12), being constantly distant from the face (121) by an amount equal to 1 mm, so as to provide maximum efficiency of the lubricant (5). Said face (200) is provided on each of its lateral edges of a circumferential rib (25), facing the groove (124) of the support crown (12). Dimensionally, the diameter D of its generator, radially closest to the axis of rotation, is the same as the diameter D of the generatrix of the groove (124) closest to the axis of rotation, this which means that the tightening of the rib on the groove is zero and that there is no compression of the rib rubber. Axially, the axial width of the rib is less than the axial width h of the groove of the support, and said rib is located axially outside the projection t on the face (200) of the diameter, in the axial direction, of the braided rod (21).

La chape (2) comprend, radialement à l'intérieur, une couche (20) de mélange vulcanisé présentant avec l'aluminium un coefficient de frottement faible tout en ayant une grande résistance mécanique, afin de pouvoir résister aux imperfections de surface de support (1), et aux corps étrangers pouvant éventuellement s'insérer entre ledit support (1) et la chape (2).The yoke (2) comprises, radially inside, a layer (20) of mixture vulcanized with a low coefficient of friction with aluminum while having high mechanical resistance, in order to be able to resist surface imperfections support (1), and to foreign bodies which may possibly be inserted between said support (1) and the yoke (2).

Symétriquement par rapport au plan équatorial XX' du dispositif, est disposée dans chaque bord inférieur de la chape (2) une tringle (21) dont le rayon intérieur R2 est inférieur au rayon intérieur maximal R1 de la couronne d'appui (12) du support (1). Les tringles (21), enrobées de mélange caoutchouteux, sont des tringles d'ancrage d'une armature de renforcement (23), composée d'une seule nappe de câbles métalliques en acier et retournée vers l'extérieur sur lesdites tringles (21) pour former des retournements (230).Symmetrically with respect to the equatorial plane XX 'of the device, is arranged in each lower edge of the yoke (2) a rod (21) whose internal radius R 2 is less than the maximum internal radius R 1 of the support crown (12 ) of the support (1). The rods (21), coated with a rubbery mixture, are anchor rods for a reinforcing reinforcement (23), composed of a single ply of metallic steel cables and turned outward on said rods (21) to form reversals (230).

Les tringles sont de type "tressé", de préférence sans âme centrale, ce qui permet une bonne résistance aux efforts de tension tout en permettant une ovalisation suffisante pour l'introduction aisée de la chape (2), ainsi renforcée, dans le pneumatique P.The rods are of the "braided" type, preferably without a central core, which allows good resistance to tension forces while allowing ovalization sufficient for easy introduction of the yoke (2), thus reinforced, in the pneumatic P.

Cette armature est surmontée radialement à l'extérieur d'une bande de roulement (24) de mélange caoutchouteux vulcanisé, ayant la particularité d'avoir des pertes hystérétiques faibles, afin de minimiser la génération d'échauffement. Cette bande de roulement (24) comprend des rainures circonférentielles (240), au nombre de deux dans l'exemple décrit.This frame is surmounted radially on the outside of a tread (24) of vulcanized rubber mixture, having the distinction of having losses weak hysteretics, in order to minimize the generation of heating. This band of bearing (24) includes two circumferential grooves (240) in the example described.

La variante du dispositif de sécurité S, montrée sur la figure 2, diffère de l'exemple montré sur la figure 1 par les caractéristiques suivantes :

  • a) les tringles (21) de renforcement ont, d'une part un diamètre de section transversale deux fois plus petit que le diamètre des tringles montrées sur la figure (1) et, d'autre part sont constituées de câbles en polyamide aromatique tout en restant de type "tressé",
  • b) l'armature de renforcement (23) est formée de deux nappes : une première nappe de câbles (231) en polyamide aromatique enroulée dans chaque bord de la chape (2) autour d'une tringle (21), ladite nappe étant surmontée dans sa partie centrale d'une nappe (232) d'éléments de renforcement circonférentiels, obtenue par enroulement d'un câble métallique en acier, jusqu'à obtention de la largeur désirée de ladite nappe (232), ladite largeur étant égale à 0,5 fois la largeur L de la partie centrale de la couronne d'appui (12),
  • c) le profil méridien latéral de la chape (2) n'est pas rectiligne, mais est formé radialement de l'intérieur à l'extérieur de l'arc de cercle (27) d'une première protubérance convexe, suivi de l'arc de cercle (28) d'un évidement concave, le rayon dudit arc de cercle (28) étant sensiblement égal au rayon de convexité de la première protubérance (27), ledit évidement (28) étant lui-même prolongé par l'arc de cercle (29) d'une deuxième protubérance convexe, assurant la liaison avec la face radialement supérieure de la chape (2), ledit arc de cercle (29) ayant un rayon de courbure tel que la distance radiale, entre les points d'inflexion I des trois arcs de cercle, soit sensiblement égale à au moins à 0,7 fois l'épaisseur e2 de la chape (2). Il est évident que les arcs de cercle définis ci-dessus peuvent être remplacés par des segments de conique, que ce soit parabole, hyperbole, ellipse ... etc ....
    • The variant of the safety device S, shown in FIG. 2, differs from the example shown in FIG. 1 by the following characteristics:
  • a) the reinforcement rods (21) have, on the one hand a cross-sectional diameter twice as small as the diameter of the rods shown in FIG. (1) and, on the other hand, consist of cables made of fully aromatic polyamide remaining of the "braided" type,
  • b) the reinforcing reinforcement (23) is formed of two plies: a first ply of cables (231) of aromatic polyamide wound in each edge of the yoke (2) around a rod (21), said ply being surmounted in its central part of a ply (232) of circumferential reinforcing elements, obtained by winding a steel wire rope, until the desired width of said ply (232) is obtained, said width being equal to 0 , 5 times the width L of the central part of the support crown (12),
  • c) the lateral meridian profile of the yoke (2) is not straight, but is formed radially from the inside to the outside of the arc (27) of a first convex protuberance, followed by the arc of a circle (28) of a concave recess, the radius of said arc of a circle (28) being substantially equal to the radius of convexity of the first protuberance (27), said recess (28) itself being extended by the arc of circle (29) of a second convex protuberance, ensuring the connection with the radially upper face of the yoke (2), said arc of circle (29) having a radius of curvature such as the radial distance, between the points of inflection I of the three arcs, ie substantially equal to at least 0.7 times the thickness e 2 of the yoke (2). It is obvious that the arcs of circle defined above can be replaced by segments of conic, that it is parabola, hyperbola, ellipse ... etc ....

    • Le profil méridien latéral et non rectiligne de chaque côté de la chape (2) est aussi le profil de la chape (2) du dispositif montré sur la figure 3, chape (2) surmontant radialement un support métallique rigide (1). La couronne d'appui (12) du support (1) présente en son centre une gorge (125) comprise axialement entre les deux rebords (122) de la couronne d'appui (12). Cette gorge (125) est destinée à recevoir la nervure (26), centrale et circulaire, de la chape élastique (2), nervure qui est renforcée par une tringle unique (21) de mêmes type et structure que les tringles (21) utilisées dans le dispositif représenté sur la figure 2. La gorge (125) a une profondeur, mesurée dans le plan équatorial XX', entre son point le plus rapproché de l'axe de rotation et la droite fictive joignant les points des rebords (122) les plus éloignés de l'axe de rotation, telle que le rayon extérieur R4 de la tringle (21) de renforcement de la nervure soit inférieur au rayon de la droite fictive ci-dessus, ladite profondeur e4 étant au moins égale à 0,25 fois l'épaisseur e2 de la chape (2). Ladite chape (2) comprend dans sa partie radialement inférieure une couche de mélange vulcanisé (20), identique à celles des chapes des figures 1 et 2, une armature de renforcement (23) composée d'une nappe (231) de câbles en polyamide aromatique, ayant une largeur sensiblement égale à la largeur de la couronne d'appui du support et passant radialement sous la tringle (21) de renforcement, et, situées de part et d'autre du plan équatorial XX', de deux nappes étroites (232) formées, chacune de câbles métalliques en acier faisant avec la direction circonférentielle un angle compris entre 0° et 5°, la largeur axiale de chacune de ces nappes (232) étant égale à 0,25 fois la largeur axiale de la nappe (231). Une bande de roulement (24), munie d'une seule rainure circonférentielle, centrée sur le plan équatorial XX', complète la chape (2), permettant ainsi en combinaison avec la présence des deux nappes étroites d'obtenir la répartition des masses la plus homogène possible. Conformément à l'invention, est disposée sur chaque rebord (122) de la couronne d'appui (12) une rainure (124) destinée à recevoir une nervure circonférentielle (25), rainure et nervure étant telles que décrites précédemment.The lateral and non-rectilinear meridian profile on each side of the yoke (2) is also the profile of the yoke (2) of the device shown in Figure 3, yoke (2) radially surmounting a rigid metal support (1). The support ring (12) of the support (1) has at its center a groove (125) included axially between the two flanges (122) of the support ring (12). This groove (125) is intended to receive the rib (26), central and circular, of the elastic yoke (2), a rib which is reinforced by a single rod (21) of the same type and structure as the rods (21) used. in the device shown in Figure 2. The groove (125) has a depth, measured in the equatorial plane XX ', between its point closest to the axis of rotation and the imaginary straight line joining the points of the flanges (122) the most distant from the axis of rotation, such that the outside radius R 4 of the rod (21) for reinforcing the rib is less than the radius of the above imaginary line, said depth e 4 being at least equal to 0 , 25 times the thickness e 2 of the yoke (2). Said screed (2) comprises in its radially lower part a layer of vulcanized mixture (20), identical to those of the screeds of FIGS. 1 and 2, a reinforcing reinforcement (23) composed of a ply (231) of polyamide cables aromatic, having a width substantially equal to the width of the support crown for the support and passing radially under the reinforcing rod (21), and, located on either side of the equatorial plane XX ', of two narrow plies ( 232) formed, each of metallic steel cables making with the circumferential direction an angle between 0 ° and 5 °, the axial width of each of these plies (232) being equal to 0.25 times the axial width of the ply ( 231). A tread (24), provided with a single circumferential groove, centered on the equatorial plane XX ', completes the yoke (2), thus making it possible, in combination with the presence of the two narrow plies, to obtain the distribution of the masses. as homogeneous as possible. According to the invention, is arranged on each edge (122) of the support ring (12) a groove (124) intended to receive a circumferential rib (25), groove and rib being as described above.

    Claims (5)

    1. A device S for supporting the tread of a tyre P, comprising at least a rigid support (1) and an elastic top cap (2) of vulcanised rubber mix, a lubricant (5) arranged between said support (1) and said top cap (2), allowing circumferential displacement between the support (1) and the top cap (2), while the radially outer form of the bearing ring (12) of the support (1) having two shoulders (122) interacts with the reinforcing elements (21, 23) located in the top cap (2) in order radially to hold and circumferentially to guide said top cap (2) on the support (1), characterised in that each shoulder (122) of the bearing ring (12) is equipped on its edge with at least one rectilinear circumferential groove (124) in which there is housed a circumferential rib (25) arranged on the radially inner face (200) of that part of the rubber top cap (2) that corresponds to the shoulder (122) of the bearing ring (12) of the support (1), said rib (25) being in contact with at least the bottom of the corresponding groove (124) of the shoulder (122), without said rib (25) being compressed against the bottom of said groove (124).
    2. A device according to claim 1, characterised in that the bearing ring (12) of the support (1) comprises a ring bottom (120) and, axially on either side, two ring shoulders (122), the radially outer face (121) of said ring bottom (120) being farther from the axis of rotation of the device than the radially outer faces (123) of the shoulders (122), and in that the elastic top cap (2) comprises, radially on the inside in each of its edges, a reinforcing bead wire (21) arranged axially facing the outer face (123) of the ring shoulder (122), each rib (25) on the radially inner face of the top cap (2) being situated axially to the outside of the projection t onto said face of the maximum axial width of the reinforcing bead wire (21).
    3. A device according to claim 2, the top cap (2) of which is reinforced by a reinforcement armature (23), characterised in that reinforcing armature (23) is composed of a ply (231) of aromatic polyamide cables, turned up around bead wires (21) situated in the lateral edges, said ply (231) being surmounted in its central part by a ply (232) of aromatic polyamide cables which are mutually parallel and are at an angle of at most 10°, and preferably very close to 0°, with respect to the circumferential direction.
    4. A device according to one of claims 1 to 3, characterised in that the top cap (2) is reinforced with one or more bead wire(s) (21) made cables of aromatic polyamide.
    5. A device according to one of claims 1 to 4, characterised in that the lateral meridian profile of the top cap (2) is composed of a concave recess (28) extended radially on the inside and on the outside by convex bulges (27, 29).
    EP97116530A 1996-10-08 1997-09-23 Supporting device for tyre tread Expired - Lifetime EP0835769B9 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    FR9612346 1996-10-08
    FR9612346A FR2754216B1 (en) 1996-10-08 1996-10-08 TREAD SUPPORT DEVICE

    Publications (3)

    Publication Number Publication Date
    EP0835769A1 EP0835769A1 (en) 1998-04-15
    EP0835769B1 EP0835769B1 (en) 2002-12-11
    EP0835769B9 true EP0835769B9 (en) 2004-12-01

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    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP97116530A Expired - Lifetime EP0835769B9 (en) 1996-10-08 1997-09-23 Supporting device for tyre tread

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    US (1) US5975171A (en)
    EP (1) EP0835769B9 (en)
    JP (1) JP4034386B2 (en)
    CA (1) CA2215998C (en)
    DE (1) DE69717758T2 (en)
    ES (1) ES2187712T3 (en)
    FR (1) FR2754216B1 (en)

    Families Citing this family (8)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US5529884A (en) 1994-12-09 1996-06-25 Eastman Kodak Company Backing layer for laser ablative imaging
    JP2004508998A (en) * 2000-09-11 2004-03-25 ダウ　グローバル　テクノロジーズ　インコーポレイティド Run-flat tire support and filament formed by reinforcing member
    WO2002022378A2 (en) * 2000-09-11 2002-03-21 Dow Global Technologies Inc. Method and device for preparing a tire support
    DE60133673T2 (en) * 2001-07-19 2009-06-10 Société de Technologie Michelin EMERGENCY REPLACEMENT FOR TIRES
    KR100592992B1 (en) * 2003-11-24 2006-06-23 금호타이어 주식회사 Pneumatic tire having Bag - type Belt Layer
    FR2940770B1 (en) * 2009-01-08 2011-03-04 Hutchinson FLAT ROLLING DEVICE FOR MOTOR VEHICLE AND MOUNTING ASSEMBLY INCORPORATING SAME
    WO2014210406A1 (en) * 2013-06-27 2014-12-31 Hutchinson, S.A. Bead lock with wheel flange protection
    JP7099114B2 (en) * 2018-07-19 2022-07-12 住友ゴム工業株式会社 wheel

    Family Cites Families (7)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US4173243A (en) * 1975-10-17 1979-11-06 Dunlop Limited Safety tire and wheel rim assembly
    US4183388A (en) * 1978-07-24 1980-01-15 General Motors Corporation Run-flat tire having internal support means
    US4327791A (en) * 1980-09-29 1982-05-04 Motor Wheel Corporation Safety tire and wheel assembly
    DE3501116A1 (en) * 1985-01-15 1986-07-17 Continental Gummi-Werke Ag, 3000 Hannover VEHICLE WHEEL
    JPH0481308A (en) * 1990-07-23 1992-03-16 Bridgestone Corp Core assembling member for pneumatic tire
    FR2707923A1 (en) * 1993-07-19 1995-01-27 Michelin & Cie Support device for a tire tread.
    FR2743530B1 (en) * 1996-01-15 1998-02-13 Michelin & Cie TIRE-RIM ASSEMBLY FOR HEAVY-DUTY VEHICLE

    Also Published As

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    US5975171A (en) 1999-11-02
    FR2754216B1 (en) 1998-12-24
    CA2215998A1 (en) 1998-04-08
    JP4034386B2 (en) 2008-01-16
    DE69717758D1 (en) 2003-01-23
    EP0835769A1 (en) 1998-04-15
    EP0835769B1 (en) 2002-12-11
    DE69717758T2 (en) 2003-09-18
    ES2187712T3 (en) 2003-06-16
    CA2215998C (en) 2005-12-06
    JPH10147118A (en) 1998-06-02
    FR2754216A1 (en) 1998-04-10

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